ballistically they are quite similar as you probably know,the only thing that would sway me to the 300win.is brass cost,other than that they are both good performers.i have seen alot more accurate 300win. rifles than i have the 300wtby.,but i have also SEEN more 300win. period.both have done well on the 1000yd.circuit over many years[and the numerous variations of both chamberings]-tough call-for me, i would pick the 300win.but thats just me-my-2-dave